another_someone

Haven't found any better explanation as yet. Lemon seems not to have many variations in its meaning (except that is is linked to 'lime' - but both are related fruits), so there seems as yet no obvious alternative explanation, except its appearance.

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another_someone

Interestingly, looking at Wikipedia, it seems the lemon sole is not even (in biological terms) in the family or true soles (etymologically, it is a flat fish, but it lives amongst rocks rather than on the flat bottom, and so it has not moved both its eyes to the right side of its head, as is common with true bottom dwelling soles).

The true soles are a family, Soleidae, of flatfishes, and include species that live in salt water and fresh water. They are bottom-dwelling fishes feeding on small crustaceans and other invertebrates. Other flatfishes are also known as soles.

Soles begin life as bilaterally symmetric larvae, with an eye on each side of the head. But during development the left eye moves around onto the right side of the head. Adult soles lie on their left (blind) side on the sea floor, often covered in mud which, in combination with their dark colours, makes them hard to spot.

Soles (along with flounders) were observed by the Bathyscaphe Trieste at the bottom of the Mariana Trench at a depth of 35,798 feet (10,911 m).

Many soles are important food species: the common sole, Solea solea, is popular in northern Europe and the Mediterranean.